Bit-forging machine



Aug. .11, 1931. L. aonrKEwlcz -BIT FORGING MACHINE 4 Filed July so, 1929 2 srmew-snat 1 NEM-ca Louie VBort kewicz h "6 Offer-g *by @MMM/M5,-

Aug. ll, 1931. L, BORTKEwlCz 1,818,601

BIT FQRGING MACHINE Filed July 50, 1929 2 Sheets-Sheet 2 `INVENTOF! Loul Bortkewz V vbr, @gw/Mm His atto rn e qs Patented Aug. 11, 1931 UNITED s'mfrlasV LOUIE BORTKEWICZ., OF RACOON, PENNSYLVANIA BIT-FORGING MACHINE Application filed July 30, 1929. Serial No. 382,214.

Thijs Linvention relates to a cutter-bit forging machine and consists in improvements in the mechanical elements of the machine to operate more effectively the forging dies.

In the forging Vof tools, such as cutterbits for coal-mining machinery, it has been found` that, if the forming dies are operated to strike a blow' which is similar to a blow 'delivered byA a hand-hammer, the grain .110 structure of the metal of the tool is superior to that of tools formed in machines having positively operated dies which press the metal toform. I

The object of the invention is to provide Q15 a machine for forging cutter-bits by a succession of blows of resiliently operated dies.

In the accompanying drawings Figure 1 is a view in top-plan elevation of themachine of my invention; Figure 2 is a view zu in rear elevation of the same; Figure 3 is a sectional view,.taken on the plane 33 of Figure 2, showing in side elevation the me-. chanical elements which operate a forging die; and Figure 4 is a sectional view, taken f 25 on the plane 4 4 of Figure 2, showing in side elevation the elementsjwhich operate another forging die.

Referring to the drawings the numeral 1 indicates the bed of the forging machine,

3o and 2 designates frame members which support' it.- The feeding device 3 presents blanks through an opening 4 in the bed of the machine to a suitably formed anvil block 5,6 and the two heads 6' and 7, having ap- .'35 propriate die faces 8 and 9 respectively, re-

ciprocate to form the cutter-bit.

As may. be -seen in Fig. l the anvil block 5 has two faces 5a and 5b which slope upwardly from the hole 4. The faces 5a and 40 5b lie angularly to each other, meeting ina corner 50.- In forging a bit the head 6 cooperates principally with the face 5a, and

the head 7 co-operates with the face 5b.

The travel of a bit blank may be traced 4 5 in Figure 3. Ain' arcuate conduit 11 is pro- `the rotation of the connecting arm 13. Ro-

tation is effected by means of the handle 14. Through an opening 15, a heated bit blank is inserted to the conduit 1l--obviously, the block 12y is first moved into the position indicated by the broken lines 12a. The handle 14 is then rotated to move the block and to feed the blank through the o ening 4 to the anvil 5, against which the eads 6 and 7 form the bit 10. Y

The invention has particularly to do with the means which operate the heads 6 and 7. vAs said, it is desirable to obtain forming blows which are similar to those delivered by a manually operated hand-hammer. I

have found that, by storing energy in resilient means, such as springs, the heads may be released to the forces of the stored energy to strike blows of the desired quality. Inthis practice I attach an arm 16 to the head 7, which slides in the way 17'. This arm is pivotally mounted between the brackets 18 of the machine, and means of the pin and groove connection 19 to the head 7, oscillation of the arm will cause reciprocation of the head. It is obvious that the head and arm may be formed integrally, if an arcuate movement of the head is desired. Fixed to 'the arm and to the machine frame is the tension spring 20, and when the arm 16y is released toy theforce of this spring spring being expanded as shown in Figure 3) it will rotate the arm and move the head 7v to strike a blow. The arm and head'Y are then returned to their inoperative position by positive mechanical elements.

These elements comprise a cam 21 which kis fixed to the counter-shaft 22. This councam has an indented surface 210i,l and rota- YUI.

tion of the cam in the direction of the arrow will free the end 16a of the arm 16 and permit the spring to operate the die head. Continuing rotation of the shaft 22 and cam 21 brings the cam portion 212) against the end 16a and moves the arm and head back to inoperative position, where, due to the cam surface 210, it is maintained for an appreciable interval of timethe interval necessary to permit the unobstructed opera.- tion of the die head 6.

The die head 6 slides in the way 30 between guides 31 and 32. It strikes the blank on the anvil a forming blow which is directed at an angle of 90O from the movement of the head 7. An arm 33 is pivoted to the fixed standard 34, and is connected to the head 6 by means of the pin and groove arrangement 35. A spring 36 is mounted to operate this arm similar to the manner in which the spring 2O operates the arm 16. By means of the helical cam 37 the end 33a of the arm 33 is released to the force of the eX- panded spring 36, which, of course, moves the die head 6 to strike a forming blow. The cam 37, obviously, is adapted to return the arm to its initial position and to retain it there until the head 7 has operated. The particular cams, which are illustrated7 are of such form as to permit both of them l. to be aflixed to the shaft 22. This is advantageous, because it permits the cams to be adjusted on a single shaft and insures a positive synchronization of the alternately moving die heads.

To prevent scale from forming and remaining on the point 10a of the hot cutter bit (during the last stages of the forging operation), I have provided a tappet rod 40, shown in broken lines, having theA depending member 41 to strike lightly the point of the bit. Suitable connections to the moving elements of the machine may be employed to render a vertical reciprocating movement to the rod 40. Such connections may conveniently be an eccentric or cam 42 which is operatively geared at 4:3 to the shaft 22.

What I claim is 1. In cutter-bit forging apparatus including a machine bed supported on a frame and an anvil secured to the machine bed, and an opening through such machine bed for feeding a bit blank to the anvil, which anvil includes two faces both of which slope upwardly from said opening and extend angularly to each other, the combination of a bit-forming head which is movable relatively to the anvil to and from forging position against one of said anvil faces, a second bit-forming head which is movable relatively to the anvil to and from forging position against the other of said anvil faces, a head-operating arm for each bitforming head, which operating arms project through said machine bed and are connected one to each of said bit-forming heads, said operating arms being each pivotally secured to the machine below said bed, yielding means for each operating arm normally urging each bit-forming head into position against said anvil, and means below said bed for periodically moving each of said operating arms alternately to store energy in its associated yielding means and for periodically and alternately releasing said arm to the energy of such yielding means.

2. In cutter-bit forging apparatus including a machine bed supported on a frame and an anvil secured to the machine bed, and an opening through such machine bed for feeding a bit blank to the anvil, which anvil includes two faces both of which slope upwardly from said opening and extend angularly to each other, the combination of a bit-forming head which is movable relatively to the anvil to and from forging position against one of said anvil faces, a second bit-forming head which is movable relatively to the anvil to and from forging position against the other of said anvil faces, a headoperating arm for each bit-forming head, which operating arms project through said machine bed and are connected one to each of said bit-forming heads, said operating arms being each pivotally secured to the machine below said bed, and means below said bed for alternately oscillating said arms angularly `about their pivotal attachment to the machine for effecting the movement of said bit-forming heads one after the other into forging position against the respective faces of said anvil.

3. In cutter-bit forging apparatus including a machine bed supported on a frame and an anvil secured to the machine bed, and an opening through such machine bed for feeding a bit blank to the anvil, which anvil includes two faces both of which slope upwardly from said opening and extend angularly to each other, the combination of a bit-forming head which is movi able relatively to the anvil to and from forging position against one of said anvil faces, a second bit-forming head which is movable relatively to the anvil to and from forging position against the other of said anvil faces, ways secured to said machine bed for each head, and a head operating arm for each of said heads, which operating arms project through said machine bed and are connected one to each of said heads, said operating arms being each pivotally secured to the machine below said bed, and means below said bed for oscillating alternately said operating arms and causing said heads to slide each in its associated way successively into forging position against said anvil.

4. In a bit-forging machine including an anvil and means for feeding a, bit blank thereto, the combination of a bit-forming heed reciprocatory to and from forging position upon said anvil, a tappet rod, a. iointtapping member associated with sai rod, and means for reeiprooatin' said rod and its associated tapping member during the forging of a cutter bit, whereby, the immediete point ofthe bit being forged is subjected to tapping blows which are eii'ectivev to work the metal of said bit point and to remove such scale as forms on said point.

In testimony whereof I have hereunto set my hand.

LOUIE BORTKEWICZ. 

